I looked around to get confirmation, and I did find some related issues. Seems like it works properly when context is defined explicitly. There also appears to be a warning logged about "truncating input prompt", so it isn't an entirely silent failure. https://github.com/ollama/ollama/issues/2653 + https://github.com/ollama/ollama/issues/4967 + https://github.com/ollama/ollama/issues/7043 + https://github.com/ollama/ollama/issues/8144